CAJ | 학술논문

利用布设在长江中下游地区的47个固定台站所接收到的473个远震事件，对该地区进行了地壳校正研究。结果显示：（1）内陆地区下方的地壳呈现为低速异常，而沿海地区下方的地壳却呈现为高速异常；（2）地壳校正前后的速度异常确有变化，但差别不是很大，说明长江中下游地区的地壳结构比较稳定；（3）随着深度的增加，速度异常的差别越来越小，说明地壳校正对浅部的速度结构影响较大，而对深部的影响较小。因此，在远震层析成像研究中，若缺少浅部信息，可以进行地壳校正，以消除或减少地壳结构对最终反演结果的影响，从而提高深部结果的质量。
이용포설재장강중하유지구적47개고정태참소접수도적473개원진사건，대해지구진행료지각교정연구。결과현시：（1）내륙지구하방적지각정현위저속이상，이연해지구하방적지각각정현위고속이상；（2）지각교정전후적속도이상학유변화，단차별불시흔대，설명장강중하유지구적지각결구비교은정；（3）수착심도적증가，속도이상적차별월래월소，설명지각교정대천부적속도결구영향교대，이대심부적영향교소。인차，재원진층석성상연구중，약결소천부신식，가이진행지각교정，이소제혹감소지각결구대최종반연결과적영향，종이제고심부결과적질량。
This paper applied a crust correction method to study the middle and lower reaches of Yangtze River region,and the data used in the study were derived from 473 teleseismic events collected by 47 permanent sta-tions.The results show that (1 )the low crust velocity anomaly is beneath inland area and the high crust velocity anomaly is beneath coastal area;(2)there are slight velocity-anomaly differences between before and after crust correction,indicating that the crust structure of the middle and lower reaches of Yangtze River region is stable;(3 )with the depth increasing,the difference of velocity anomaly is becoming smaller,which means the impact of crust correction method in shallow depth is big while in deep depth is small.Therefore,in the teleseismic tomography study,if shallow information is shortage,the crust correction can be used to eliminate or reduce the influence of crust velocity structure to the final inverse results,and improve the quality of results in deep depth.